Finding the Fourth Proportional to 1,230.42, 1,846.69 and 645.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,230.42 : 1,846.69 = 645.83 : x
2. Step 2: Convert to fraction form
   1,230.42/1,846.69 = 645.83/x
3. Step 3: Cross multiply
   1,230.42x = 1,846.69 × 645.83
4. Step 4: Simplify right side
   1,230.42x = 1,192,643.88
5. Step 5: Solve for x
   x = 1,192,643.88/1,230.42
6. Step 6: Final answer
   x = 969.30